Mixing Windows Forms and FPE for XNA

Hi guys, I'd like to build a Windows .Net app around the engine as an explorer for constructing and manipulating scenes and/or composite objects while the engine runs (with pause, play etc.) Thought it would be a fun sandpit for playing around with ideas
before getting it to generate the XNA code. Any Ideas how best to blend .Net apps with FPE for XNA and have the engine render to a windows .net window or control while allowing the normal windows forms operation to go on around it?